Classification processing method for high-liquid-limit soil in roadbed engineering

Abstract

A disclosed classification processing method for high-liquid-limit soil in roadbed engineering comprises the following steps: S1, doping quicklime with high-liquid-limit soil for reducing water content; S2, employing plasticity index, CBR (California bearing ratio) value, liquid limit and fine-particle content to classify the high-liquid-limit soil processed in the step S1; and S3, respectively processing classified high-liquid-limit soil. The method helps to obviously reduce water content of soil, comprehensively gives consideration to improvement difference degree of doping sand, quicklime and cement to various physical properties of soil, and helps to effectively improve construction quality, reduce discarded soil or borrowed soil quantity, and save engineering cost, thereby promoting scientific utilization of high-liquid-limit soil.

Description

technical field [0001] The invention relates to the field of construction, in particular to a classification treatment method for soil with high liquid limit in roadbed engineering. Background technique [0002] At present, the commonly used classification method for high liquid limit soil is to divide high liquid limit soil into: high liquid limit clay, high liquid limit silt, sandy high liquid limit clay and sandy high liquid limit silt based on plastic index and fine particle content. earth. See Table 1 for details. [0003] Table 1 Classification of high liquid limit soil engineering [0004] soil Liquid limit plasticity index Less than 0.074mm fine particle content High liquid limit clay ≥50％ ≥0.73(W L -20) ≥75％ High liquid limit silt ≥50％ ＜0.73(W L -20) ≥75％ Sand-bearing high liquid limit clay ≥50％ ≥0.73(W L -20) 50%≤fine particle content≤75% Sand-containing high liquid limit silt ...

AI Technical Summary

Problems solved by technology

[0005] Since the high liquid limit soil has many bad physical and mechanical properties such as high liquid plastic limit, high natural moisture content, low permeability, and high compressibility, the following problems need to be solved when using high liquid limit soil as embankment filler: First, the problem of high natural moisture content, high liquid limit and high plasticity index; second, the problem of low strength, high compressibility and low permeability; third, the problem of excessive fine particle content of high liquid limit soil and poor particle gradation ; and finally, issues of water stability and poor compaction performance

Images